Hadith 2:116

Narrated 'Asim:

I asked Anas bin Malik about the Qunut. Anas replied, "Definitely it
was (recited)". I asked, "Before bowing or after it?" Anas replied,
"Before bowing." I added, "So and so has told me that you had informed
him that it had been after bowing." Anas said, "He told an untruth
(i.e. "was mistaken," according to the Hijazi dialect). Allah's
Apostle recited Qunut after bowing for a period of one month." Anas
added, "The Prophet sent about seventy men (who knew the Quran by
heart) towards the pagans (of Najd) who were less than they in number
and there was a peace treaty between them and Allah's Apostles (but
the Pagans broke the treaty and killed the seventy men). So Allah's
Apostle recited Qunut for a period of one month asking Allah to punish
them."